Please show step by step how to solve and if it is favorable or unfavorable and why.

The following information is available for Patrick Products for the year:

Budgeted sales during the year	5,000 units
Actual sales during the year	4,500 units
Budgeted machine hours required for the year	10,000 hours
Actual machine-hours during the year	9,000 hours
Budgeted variable overhead costs	$2,500,000
Actual variable overhead costs	$2,375,000

What is the variable overhead flexible-budget variance for the year? Assume machine-hours as the only cost-allocation base.